Overview
The TPS3813K33DBVRG4 is a part of the TPS3813xxx family of supervisory circuits produced by Texas Instruments. These circuits are designed to provide circuit initialization and timing supervision, primarily for DSPs and processor-based systems. During power-on, the RESET signal is asserted when the supply voltage (VDD) rises above 1.1V and remains low until VDD exceeds the threshold voltage (VIT). The device features a fixed delay time of 25ms after VDD rises above VIT to ensure proper system reset. It also includes a window-watchdog timer with programmable delay and window ratio, enhancing its suitability for safety-critical applications.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Package | 6-Pin SOT-23 | 2.90mm × 1.60mm |
| Supply Voltage Range | VDD | 2V to 6V |
| Threshold Voltage (VIT) | VIT for TPS3813K33DBVRG4 | 2.93V |
| Supply Current | Typical | 9µA |
| Power-On Reset Delay | Typical | 25ms |
| Temperature Range | Operating | –40°C to 85°C |
| Watchdog Timer Input | WDI | Must be driven at all times, not left floating |
| Programmable Watchdog Delay Input | WDT | Set by connecting to GND, VDD, or using an external capacitor |
| Reset Output | Open-drain | Can be pulled up to any voltage up to 6V |
Key Features
- Window-Watchdog Timer: Programmable delay and window ratio to ensure the supervised processor triggers the WDI pin within a specified window.
- Power-On Reset Generator: Fixed delay time of 25ms to ensure proper system reset.
- Precision Supply Voltage Monitor: Supports threshold voltages of 2.5V, 3V, 3.3V, and 5V.
- Low Supply Current: Typical supply current of 9µA.
- Open-Drain Reset Output: Can be pulled up to any voltage up to 6V.
- Compact Package: 6-Pin SOT-23 package.
- Wide Temperature Range: Operates over a temperature range of –40°C to 85°C.
Applications
- Active Antenna System mMIMO (AAS): Used in advanced wireless communication systems.
- Storage Area Network: Ensures reliable operation in data storage systems.
- Electricity Meters: Provides accurate voltage monitoring in metering applications.
- Safety Critical Systems: Suitable for systems requiring high reliability and fault tolerance.
- Infusion Pumps: Used in medical devices to ensure precise and reliable operation.
- HVAC Controllers: Monitors and controls heating, ventilation, and air conditioning systems.
Q & A
- What is the primary function of the TPS3813K33DBVRG4?
The primary function is to provide circuit initialization and timing supervision, especially for DSPs and processor-based systems.
- What is the threshold voltage (VIT) for the TPS3813K33DBVRG4?
The threshold voltage (VIT) for the TPS3813K33DBVRG4 is 2.93V.
- How is the watchdog timer delay set in the TPS3813K33DBVRG4?
The watchdog timer delay can be set by connecting the WDT pin to GND, VDD, or using an external capacitor.
- What is the power-on reset delay time for the TPS3813K33DBVRG4?
The power-on reset delay time is typically 25ms.
- What is the operating temperature range for the TPS3813K33DBVRG4?
The operating temperature range is –40°C to 85°C.
- Can the reset output be pulled up to any voltage?
- What is the typical supply current of the TPS3813K33DBVRG4?
The typical supply current is 9µA.
- What types of applications is the TPS3813K33DBVRG4 suitable for?
- How does the window-watchdog timer function in the TPS3813K33DBVRG4?
The window-watchdog timer requires the supervised processor to trigger the WDI pin within a user-programmable window to prevent a reset signal from being issued.
- Is an external capacitor required for the input supply of the TPS3813K33DBVRG4?
No, an external capacitor is not required, but it is recommended for noisy input supplies.
